



C is the external condenser placed between the side pipes and the ordinary condenser. This external condenser is here formed by thc small ltubes a a d, through which the steam passes, entering the external condenser by Ihe nozzle M, and leaving by the nozzle N, these small tubes being surrounded on the outside by a continuous supply of cold water which enters the case D in which they are placed by t-he nozzle E and leaves it by the nozzle F.

G is the cooler that cools the water taken from the hotwell and is placed between the hot well and injection-pipe. This cooler is here formed by two tubes c c, coiled in a spiral form and surrounded by a continuous supply of cold water, which enters the case II in which the coils are placed at the nozzle I and leaves it at the nozzle K.

Lis the injection-pipe that conducts the water from the hot wel] to the cooler.

lV is the injection-pipe thatconducts the water from the cooler to the ordinary condenser; but the form of the apparatus which I prefer to use is shown in Fig. IV, which is a side elevation of my combination of an external condenser with a cooler, the condenser and cooler being of a different form from .those shown in Figs. I, II, and III. Fig. V is a front elevation of the same. Fig. VI is a horizontal view of the same, showing the top of the external condenser. Fig. VII is a horizontal view of the same, showing the top of the cooler.

A is the ordinary condenser.

I is a pipe proceeding from the cylinder and side pipes to the external condenser.

M is the external condenser placed between the side pipes and the ordinary condenser. This condenser is here formed by horizontal rectangular passages dd d, through which the steam passes from the side pipes to the ordinary condenser, while the cooling-water passes on the reverse side of the surface and through the rectangular passages e e e at a direction at right angles to the direction of the current of the steam, entering at the nozzle N and leaving at the nozzle O.

P is a cooler that cools the water from the hot well. This cooler is formed in the same manner that the external condenser is, excepting that the water to be cooled is turned backward and forward through the rectangular passages f f f, entering the cooler at the portion of the steam, together with the Water that has been formed from the part condensed, passes on to the ordinary condenser, where the uncondensed steam is condensed by the water from the cooler entering by the injection-pipe IV in the same manner that steam is ordinarily condensed by injection.

I do not claim as my invention the combination of the surface-condenser with the ordin-ary condenser where the surface-condenser is used to condense a portion of the steam, the remaining portion being condensed by the ordinary condenser and in the ordinary manner, as the external condenser was thus applied as an auxiliary condenser by Robert- L. Stevens and Edwin A. Stevens about the year 1830 to the engine of the steamboat New Philadelphia in theharbor of New York; but

That I claim as my invention isl. The combination of a surface or external condenser with a cooler, so that a part of the steam is condensed by external condensation and a part by the injection of water withdrawn from the condenser and cooler after having been cooled there.

2. The combination of a surface or external condenser placed between the side pipes and the ordinary condenser of a steam-engine with a cooler for cooling the Waterfrom the hot Well, this cooler being placed between the hot well and the ordinary condenser, so that the steam after being partially condensed by the external condenser is then further condensed b y means of the injection of the cooled Water from the hot well into the ordinary condenser, the surfaces of both external condenser and cooler being cooled by the application of water.

New York, September lf), 1861.

FRANCIS B. STEV Witn esses:

CORNELIUS OREEDON, JULIUs HoRNIG. 

